Jim Meyering
8406b91aba
(docolon): Test (re_buffer.re_nsub > 0) rather than
...
searching for `\(' to determine whether to return 0 or the empty
string. Before it would improperly return '' if the pattern
contained a substring like this: `\\('. From Karl Heuer.
For example, running expr c : '\\(' should print `0'.
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